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#1 2005-10-19 15:39:24
- Nikky
- Guest
HELP! Math Question
Can someone help with this?
...
A person drives at a constant speed of 97km/h except for a break that he takes which is 26.4 minutes long. If the average speed of the trip is 64km/h...
How long did the whole trip take?
How far does the person go?
#2 2005-10-19 16:09:15
- ryos
- Power Member
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Re: HELP! Math Question
speed = distance / time
Average speed also = distance / time
Assume two chunks of time: t1 spent driving at 97 km/hr and t2=26.4min spend driving at 0 km/hr
Convert break to hours: 26.4/60 = 0.44 hr
Average the speeds: (s1 + s2) / (t1 + 0.44)
(97 + 0) / (t1 + 0.44) = 64
t1 = 97/64 - 0.44 = 1.075625
Or, total time = 1.515625 hr and total distance = 64 km/hr * 1.075625 hr = 68.84 km.
But, I may have done it wrong. It's late and I haven't checked for mistakes...
Last edited by ryos (2005-10-19 16:15:43)
El que pega primero pega dos veces.
#4 2005-10-20 21:00:04
- DAN
- Guest
Re: HELP! Math Question
I love maths. It's so fun and exciting. Please tell me more. Oh maths!! (Jelly babies)
#5 2005-10-20 21:35:25
- justlookingforthemoment
- Moderator
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Re: HELP! Math Question
Insomnia...? You have a jelly baby fan friend.
#6 2005-10-20 22:43:10
- MathsIsFun
- Administrator
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Re: HELP! Math Question
You can combine maths and jelly babies. Count them.
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
#8 2005-10-21 07:16:46
- MathsIsFun
- Administrator
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Re: HELP! Math Question
Oh, and they would probably be the first to notice if they didn't get the right change.
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman